<html xmlns="http://www.w3.org/1999/xhtml" 
      xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
      class="reftest-wait">
      
<head>
<script>
function boom()
{
  var y = document.getElementById("y");
  y.parentNode.removeChild(y);
  document.documentElement.removeAttribute("class");
}
</script>

</head>
<body onload="setTimeout(boom, 30);">

<div style="float: left">X<xul:hbox><input type="radio"/></xul:hbox></div>
<div id="y" style="float: left">Y</div>

</body>
</html>
